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March 22, 2026

CAISO/WEIM

The California Independent System Operator serves about 80% of California's electricity demand, including the service areas of the state's three investor-owned utilities. It also operates the Western Energy Imbalance Market, an interstate real-time market covering territory that accounts for 80% of the load in the Western Interconnection.
CAISO Board OKs Grid Services Requirements for Renewables
The CAISO Board of Governors approved proposed Tariff revisions that will require new renewable resources be capable of providing grid-stability services as a condition for interconnecting with the ISO’s system.
CAISO Kicks off Effort to Track GHGs Under Regionalization
CAISO launched an initiative to develop a greenhouse gas accounting system suitable for an expanded ISO.
New Western EIM Participants on Track to Join Market in October
Arizona Public Service and Puget Sound Energy have met the milestones to participate in the CAISO-run Western EIM and will begin trading in the market on Oct. 1.
EIM Governing Body Convenes First Meeting, Selects Leadership
The newly established Western Energy Imbalance Market (EIM) governing body kicked off its first meeting last week by electing its leadership.
SoCal Gas Restrictions Unlikely to Impede Winter Grid Operations
Winter grid operations in Southern California are unlikely to be compromised by natural gas pipeline restrictions due to the shutdown of Aliso Canyon.
CAISO Proposes Broadening LSE Definition
CAISO is proposing to amend its Tariff to expand the definition of a “load-serving entity” to include any organization granted authority to serve its own electricity needs.
UPDATED: California Legislature Approves Bill to Sharply Reduce GHG Emissions
California lawmakers last week passed SB 32, a bill to reduce the state’s greenhouse gas (GHG) emissions to 40% below 1990 levels by 2030.
FERC OKs CAISO Energy Storage Rules
FERC approved rule changes to improve the ability of energy storage resources to participate in CAISO markets.
Berkshire Affiliates Refund $95K After Market-Based Rate Ruling
Berkshire Hathaway Energy affiliates NV Energy and PacifiCorp refunded nearly $95K to customers after FERC revoked their market-based rate authority.
California Policy Goals to Require Significant Transmission Upgrades
California and CAISO must significantly upgrade its transmission system to meet its target of generating 50% of its electricity from renewable resources.

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